I am assuming that by “demonstrate” you mean "describe". I can completely describe competition between two companies in five words:
The two companies are compared.
Competition means comparison. Nothing less, but nothing more. Such comparisons usually have a purpose. The purpose is often to make some sort of decisions: what to buy, where to work, etc. but the decision is made on the basis of comparison.
How many ways can two firms or companies be compared?
There are, of course, any number of dimensions in which comparison can take place, but there are five main areas of comparison that we...